`A_(1)` and `A_(2)` are two ores of metal `M.A_(1)` on calcination gives a black precipitate, `CO_(2)` and water. Identify `A_(1)` and `A_(2)`.
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A_(1) & A_(2) are two ores of metal M. Ar on calcination gives black precipitate, CO_(2) & water.

Let points A_(1), A_(2) and A_(3) lie on the parabola y^(2)=8x. If triangle A_(1)A_(2)A_(3) is an equilateral triangle and normals at points A_(1), A_(2) and A_(3) on this parabola meet at the point (h, 0). Then the value of h I s

A_(1) and A_(2) are two vectors such that |A_(1)| = 3 , |A_(2)| = 5 and |A_(1)+A_(2)| = 5 the value of (2A_(1)+3A_(2)).(2A_(1)-2A_(2)) is

If a_(0), a_(1), a_(2),… are the coefficients in the expansion of (1 + x + x^(2))^(n) in ascending powers of x, prove that a_(0) a_(2) - a_(1) a_(3) + a_(2) a_(4) - …+ a_(2n-2) a_(2n)= a_(n+1) .

If vec(a_(1)) and vec(a_(2)) are two non-collinear unit vectors and if |vec(a_(1)) + vec(a_(2))|=sqrt(3) , then the value of (vec(a_(1))-vec(a_(2))). (2 vec(a_(1))+vec(a_(2))) is :

If a_(1) and a_(2) aare two non- collineaar unit vectors and if |a_(1)+a_(2)|=sqrt(3), ,then value of (a_(1)-a_(2)).(2a_(1)-a_(2)) is

If a_(1) and a_(2) are two non- collinear unit vectors and if |a_(1)+a_(2)|=sqrt(3), ,then value of (a_(1)-a_(2)).(2a_(1)-a_(2)) is

If A_(1),A_(2) are between two numbers, then (A_(1)+A_(2))/(H_(1)+H_(2)) is equal to

a_(1), a_(2),a_(3) in R - {0} and a_(1)+ a_(2)cos2x+ a_(3)sin^(2)x=0 " for all " x in R then (a) vectors veca=a_(1) hati+ a_(2) hatj + a_(3) hatk and vecb = 4hati + 2hatj + hatk are perpendicular to each other (b)vectors veca=a_(1) hati+ a_(2) hatj + a_(3) hatk and vecb = hati + hatj + 2hatk are parallel to each each other (c)if vector veca=a_(1) hati+ a_(2) hatj + a_(3) hatk is of length sqrt6 units, then on of the ordered trippplet (a_(1), a_(2),a_(3)) = (1, -1,-2) (d)if 2a_(1) + 3 a_(2) + 6 a_(3) = 26 , " then " |veca hati + a_(2) hatj + a_(3) hatk | is 2sqrt6

Two blocks are arranged as shown in figure. Find the ratio of a_(1)//a_(2) . ( a_(1) is acceleration of m_(1) and a_(2) that of m_(2))